Has the door got heavier recently?
Mine had a spring break which fell onto the electrics and shorted them. Unplug and empty it, then tip it up to see if you can see a loose spring. If it is then replace or re-fit the old spring, I have posted instructions and pictures here:http://www.howtofixanything.co.uk/howto-260.html

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Is it on a dedicated circut? A dishwasher needs to have a 12Ga two conductor with ground line that is dedicated to ONLY the dishwasher and possibly share with the garbage disposal.
Also, it should be on a 20 Amp breaker.

Make sure (with and electric field tester/2-prong tester/DMM/VOM) that there's 120VAC to yourdishwasher. You can also check the circuit breaker - it may be OFF or TRIPPED.Its easy to see when a breaker is OFF, but harder to see a TRIPPED breaker - the togglestops halfway between ON and OFF when a breaker trips, and its easy to miss in the dimlight of a typical garage or basement (this electrician knows from experience). To reseta TRIPPED breaker, you must throw the toggleswitch to OFF, then reset it by throwing the toggle to ON.If your residence has a fuse panel, check you fuse and consider buying a reset-able screw-inreplacement from your local electrical supply.

Hello there, If this unit is tripping the breaker lets say on the pump out drain cycle, then you for sure have a problem in the motor and pump assembly.Anytime a breaker trips, if the breaker isn't worn out, it indicates that it is drawing more amps than it is rated for due to an overload problem and so on.You're motor and pump needs to be checked out on site with the proper electrical tools and so on. Wish I were there to help.Good Luck, Shastalaker7

Our AEG dishie also tripped the light regularly. Turned out there was a water leak by the motors and the cut off device wasn't working and when the water filled up too much it tripped. Move the dishie and if water 'sloshes' out the back, then you know the problem, or if not, take the side panels off so you can see underneath, if there is water at the bottom of the machine. Hope you find the problem.

i had this probem and apparently there's a 'float switch' in the bottom of the machine. This switch is a safety cut off and when activated can not just stop the machine but trip the electrics in the house. the reason for it activating is when food clogs up the drainage bit water can not drain and fills up the bottom of the machine. this then activates the 'float switch' as a kind of safety cut off.
the way to sort it is to disconect the machine from the mains and drain and water. empty the clogged up food from the drain bit. then tip the machine back and a load of water will pour out (may need a load of towels for this bit or take the machine out the back and do it)
once this is done, plug it all back in and give it a try - works for my machine, good luck.